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S:\HP892XX\USRGUIDE\manual\decoscrn.fb
Chapter 8, Signaling Decoder Screen
Function Generator Decoder
Arm Meas
Arm measurement prepares the decoder to be triggered by an incoming signal
when making single measurements.
Frequency
This measurement displays the decoded signal’s frequency.
Gate Time
This field specifies the minimum time the decoder analyzes a signal after it has
been triggered.
Input Level
This field specifies the signal level that you input (after de-emphasis if it is turned
on). The higher the level of signal expected by the analyzer, the higher the trigger
level is set.
Operating Considerations
The unit-of-measure is determined by the AF Anl In setting.
The input level should be set high enough to prevent false triggering, but low
enough to allow triggering for fluctuating signal levels.
If de-emphasis is used (by setting the AF Analyzer’s
De-Emphasis field to
750 µs), the Input Level should be set to about 1/5 of the measured signal’s
level. For example, a 1 kHz, 1 Vpeak sinewave into the AF Analyzer’s input
requires an
Input Level of approximately 0.212 V to trigger correctly.
See Also
Trig Level
field description, on page 308
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